subordinate peripheral nations economically and militarily. Kovel further said that capitalism itself spurs conflict and ultimately war. Kovel stated that the war on terror between Islamist extremists and the United States is caused by "oil imperialism", whereby the capitalist nations require control over sources of energy, especially oil, which are necessary to continue intensive industrial growth"; in the quest for control of such resources, Kovel argued that the capitalist nations, specifically the United States, have come into conflict with the predominantly Muslim nations where oil is often found. Kovel believed that state or self-regulation of markets does not solve the crisis "because to do so requires setting limits upon accumulation", which is "unacceptable" for a growth-orientated system, and that terrorism and revolutionary impulses cannot be tackled properly "because to do so would mean abandoning the logic of empire". Eco-socialists feel that increasing repressive counter-terrorism increases alienation and causes further terrorism and believe that state counter-terrorist methods are, in Kovel and Löwy's words, "evolving into a new and malignant variation of fascism", echoing Rosa Luxemburg's "stark choice" between "socialism or barbarism", which was believed to be a prediction of the coming of fascism and further forms of destructive capitalism at the beginning of the 20th century. Luxemburg was in fact murdered by proto-fascist Freikorps in the revolutionary atmosphere of Germany in 1919. Critique of other forms of green politics and socialism Kovel criticized many within the green movement for not being overtly anti-capitalist, for working within the existing capitalist, statist system, for voluntarism, or for reliance on technological fixes. He suggested that eco-socialism differs from green politics at the most fundamental level because the four pillars of green politics and the "Ten Key Values" of the Green Party of the United States do not include the demand for the emancipation of labor and the end of the separation between producers and the means of production. Opposition to within-system approaches, voluntarism, and technological fixes Kovel was highly critical of those within the green movement who favour "working within the system"; while he recognized the ability of within-system approaches to raise awareness, and believe that "the struggle for an ecologically rational world must include a struggle for the state", he believed that the mainstream green movement is too easily co-opted by the current powerful socio-political forces as it "passes from citizen-based activism to ponderous bureaucracies scuffling for 'a seat at the table'". For